Y690A Series Gas Blanketing Regulator reduces a high-pressure gas, such as nitrogen, to maintain a protective environment above any liquid stored in a tank or vessel. The regulator replaces the volume of vapors with a volume of blanketing gas to prevent the internal vessel pressure from decreasing, when liquid is being pumped out or when the vessel is suddenly cooled, causing vapors to contract. In both cases a slight positive vessel pressure prevents outside, air, moisture and other contaminants from entering the vessel. Type Y690A is a direct-operated regulator used for accurate pressure control on very low-pressure blanketing systems. Downstream pressure is sensed through a pitot tube installed in the lower casing of the regulator, thus no external control line is required. Type Y690AM uses a control line to more accurately control the pressure if the regulator is mounted away from the tank.


Features & Benefits
Easy Conversion Between Constructions
Sour Gas Service Capability
Inlet Pressure Equals Outlet Pressure
Corrosion Resistance
Multiple Applications


Specifications
Body Sizes
NPS 3/4 or 1 / DN 20 or 25

Maximum Allowable Inlet Pressure
150 psig / 10.3 bar

Maximum Outlet Pressure (Casing)
150 psig / 10.3 bar

Maximum Emergency Outlet Pressure to Avoid Internal Parts Damage
150 psig / 10.3 bar

Material Temperature Capabilities
Nitrile (NBR): -20 to 180º F / -29 to 82ºC
Fluorocarbon (FKM): 40 to 300ºF / 4 to 149ºC
Ethylenepropylene (EPDM): -20 to 275ºF / -29 to 135ºC
Perfluoroelastomer(FFKM): -20 to 300ºF / -29 to 149ºC

Pressure Setting Adjustment
Adjusting Screw

Spring Case Connection
1/4 NPT

Diaphragm Case Connection
1/2 NPT

Approximate Weight
19 pounds / 8.6 kg

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